Fix test errors (#31)

* test: disable `ActivityImageService` manual test class in default build

The test method was already disabled, but the Spring test context for the class was still being created during the regular test run. Moving `@Disabled` to the class prevents the Testcontainers-based application context from loading for this manual-only test and stops `verify` from failing.

Signed-off-by: Marcus Fihlon <marcus@fihlon.swiss>

* fix: handle missing timezone in activity title generation

Default title generation could fail when parsed activity data had no timezone set. This change adds a null/blank fallback in `ActivityFormatter` so titles can still be generated without throwing a `NullPointerException`.

Signed-off-by: Marcus Fihlon <marcus@fihlon.swiss>

* fix(testcontainers): align versions and stabilize PostGIS setup

Unify Testcontainers dependencies to a consistent version and remove
custom container tweaks that caused instability with Podman.

- align all Testcontainers dependencies to 2.0.5
- remove `HostPortWaitStrategy` (PostgreSQLContainer already defines an appropriate wait strategy)
- remove `withReuse(true)` (may retain state across runs and break reproducibility)

Signed-off-by: Marcus Fihlon <marcus@fihlon.swiss>

---------

Signed-off-by: Marcus Fihlon <marcus@fihlon.swiss>

pom.xml

@@ -23,7 +23,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <java.version>17</java.version>
         <jjwt.version>0.12.3</jjwt.version>
-        <testcontainers.version>2.0.3</testcontainers.version>
+        <testcontainers.version>2.0.5</testcontainers.version>
     </properties>
 
     <dependencies>
@@ -170,15 +170,14 @@
         <dependency>
             <groupId>org.testcontainers</groupId>
             <artifactId>testcontainers-junit-jupiter</artifactId>
-            <version>2.0.2</version>
+            <version>${testcontainers.version}</version>
             <scope>test</scope>
         </dependency>
 
-
         <dependency>
             <groupId>org.testcontainers</groupId>
             <artifactId>testcontainers-postgresql</artifactId>
-            <version>2.0.1</version>
+            <version>${testcontainers.version}</version>
             <scope>test</scope>
         </dependency>
 
@@ -193,4 +192,4 @@
         </plugins>
     </build>
 
-</project>
+</project>